[python3/en] added int div, modulo, and scoping

Added integer or truncation division, the modulo operator which were missing from operators section. Added function scoping in the functions section.
Alright, I guess I missed that one good catch and I'll add function scoping to the python 2.7 in another pull request. The integer division works differently in python 2.7 so I'll test it before I add that part.
I'm not sure how to add the changes to this same github pull request sorry. Can I just close and try again?